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为解决化石燃料燃烧带来的问题,需要对燃料的基础燃烧特性进行深入研究。为此通过数值计算研究了初始压强50~101k Pa,初始温度298~353K,当量比0.6~1.5异辛烷的预混层流火焰结构特性,分析了初始压强、初始温度、当量比对火焰厚度、反应区厚度、厚度比的影响。数值计算结果表明:火焰厚度、反应区厚度、厚度比会随着初始压强和初始温度的升高而减小,随当量比的增加先减小后增大;火焰厚度、反应区厚度、厚度比分别在当量比1.1,0.9,1.3时获得最小值;层流燃烧速度与H+OH的最大浓度有密切关系,都随初始温度的增加而增加,随初始压强的增加而减小。通过敏感性分析,发现H主要通过R3,R24,R97,R162,R163,R179生成,通过R1,R12,R14消耗;OH主要通过R1与R14生成,通过R3,R12,R16,R29,R95,R97消耗。
In order to solve the problems caused by the combustion of fossil fuels, further research on the basic combustion characteristics of the fuels is needed. For this reason, the structural characteristics of premixed laminar flow flame with initial pressure of 50 ~ 101k Pa, initial temperature of 298 ~ 353K and equivalence ratio of 0.6 ~ 1.5 isooctane were studied. The effects of initial pressure, initial temperature and equivalence ratio on flame thickness , Reaction zone thickness, thickness ratio. The numerical results show that the thickness of the flame, the thickness of the reaction zone and the thickness ratio decrease with the increase of the initial pressure and the initial temperature, decrease first and then increase with the increase of equivalence ratio. The thickness of the flame, the thickness of the reaction zone, the thickness ratio Respectively, at the equivalent ratio of 1.1,0.9,1.3 to obtain the minimum value; laminar flow combustion rate and the maximum concentration of H + OH are closely related, both with the initial temperature increases, with the increase of the initial pressure decreases. Through the sensitivity analysis, we found that H is mainly generated by R3, R24, R97, R162, R163 and R179 and consumed by R1, R12 and R14. OH is mainly generated by R1 and R14 through R3, R12, R16, R29, R95 and R97 Consumption.